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                [TOC] ### JSON.stringify方法會忽略對象的不可遍歷的屬性。 設置 `enumerable ` 則不會被JSON 解析 ``` var a={}; Object.defineProperties(a,{ name:{ value:"ccc", enumerable:true, }, age:{ value:"123", enumerable:false, } }) JSON.stringify(a); //{"name":"ccc"} ``` ### JSON.stringify 第二參數,指定需要轉換的屬性 只有在第二參數中的屬性才會轉換(白名單) ``` var a={ name1:"ccc1", name2:"ccc2", name3:"ccc2", }; var b =['name1','name2']; JSON.stringify(a, b); //{"name1":"ccc1","name2":"ccc2"} ``` ### 第二個參數還可以是一個函數,用來更改JSON.stringify的返回值 ``` function f (key, val) { if (typeof val=='number'){ return val*2 }else{ return val; } } JSON.stringify(a, f); //{"name1":4,"name2":6,"name3":8} ```
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